ECG Rhythm Characteristics Flashcards
Normal Sinus Rhythm
60 - 100 bpm
pwave upright
normal PR and QRS
Sinus Brady
< 60 bpm
Sinus Tachy
> 100 bpm
Ventricular Tachycardia
100 - 250 bpm
P wave is not visible
No PR interval
wide QRS
Ventricular Fibrillation
rate is unknown
irregular
no p wave, no PR, no QRS
disorganized pattern of electrical activity
Idioventricular Rhythm
slow, regular ventricular rhythm
< 50 bpm
no p waves
prolonged QRS
Atrial Fibrillation
usually > 100bpm
irregular
no p wave, QRS normal, PR visible
Premature Ventricular Contraction (PVC)
rate depends on underlying rhythm
early p waves, visible but depends on timing of PVC (may be hidden)
PR is slower
QRS - sharp and abnormal during PVC
Atrial Flutter
75 - 150 bpm
“flutter” P waves
unable to measure PR
QRS is usually normal and upright
Atrial tachycardia
form of SVT
narrow complex
tachy
p waves differ
Premature Atrial Complex (PAC)
abnormal P wave
normal QRS complex
Junctional Escape Rhythm
no preceding p wave
regular QRS
late beats
Premature Junctional Contraction
normal QRS
inverted P wave
early beats
First degree AV block
60 -100 bpm
prolonged PR interval
QRS normal
Second degree AV block Type I
regular atrial rhythm but exceeds ventricular rate
ventricular rhythm is irregular
PR progressively prolongs with each QRS
PR interval shorter after dropped beat
Third degree AV block
complete heart block
ventricular rate slower than atrial rate
no relation between P waves and QRS complexes
no constant PR interval
Torsades de Pointes
“twisting” of QRS
Second degree heart block Type II
constant PR interval (either normal or prolonged) of all conducted p waves, followed by a sudden failure of a p wave to be conducted to the ventricles
